Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a display screen or portion thereof withtransitional graphical user interface showing a first image in asequence, showing our new design;

FIG. 2 is a front view showing a second image thereof;

FIG. 3 is an enlarged view of the claimed portion in FIG. 1 ; and,

FIG. 4 is an enlarged view of the claimed portion in FIG. 2 .

The outermost broken lines illustrating portions of a display screen orportion thereof form no part of the claimed design. The dot-dashedbroken lines define the boundary of the claimed design and form no partof the claimed design. The remainder of the broken lines illustratingportions of the graphical user interface forms no part of the claimeddesign.

The appearance of the transitional graphical user interface sequentiallytransitions between the images shown in FIGS. 1-2 . The process orperiod in which one image transitions to another image forms no part ofthe claimed design.

CLAIM The ornamental design for a display screen or portion thereof withtransitional graphical user interface, as shown and described.